Really good art and animation for the main character, the doors, and most enemies (though I wasn't a fan of the things that look like briefcases). Even the idle animation for the main character is great! Very lively, with a lot of personality. Nice music.
In terms of the powerups, I was pretty impressed with the wall-climbing ability. This is not easy to implement, but it works pretty well.
Overall, however, the game suffers from controls that are not as responsive as they should be. The basic attack has a very short range, and the jump has this weird forward motion which makes it impossible to jump straight up. For future projects, I'd recommend you focus on solid controls at an early stage.
That said, an original and charming little entry.